After reading a little bit about different consensus algorithms, I am just trying to understand why Bitcoin still uses proof-of-work. This consensus algorithm being exponentially expensive, and resource intensive, doesn't it make more sense for Bitcoin --the most expensive cryptocurrency out there-- to migrate to proof-of-stake?
Currently, Bitcoin transactions are so expensive that day-to-day transactions, like buying a cup of coffee, can be more expensive than the good/service itself in some parts of the world, which fails to deliver one of the original goals of Bitcoin. That is to be the common person's every-day money.
Why does Bitcoin stick to the proof-of-work consensus algorithm?